4-Cyano-5-(difluoromethyl)-3-fluoropyridine-2-sulfonyl chloride
4-Cyano-3-(difluoromethyl)-2-fluoropyridine-5-sulfonyl chloride
6-Cyano-3-(difluoromethyl)-4-fluoropyridine-2-sulfonyl chloride
6-Cyano-2-(difluoromethyl)-4-iodopyridine-3-carboxaldehyde